在c#中找到gsm调制解调器端口

Question

我想遍历可用的端口:System.IO.Ports.SerialPort.GetPortNames()以查找gsm调制解调器是否使用了某个端口.请问任何想法.

Answer 1

我在申请中做了一项类似的任务:

1. 要检查调制解调器是否连接到特定端口,您可以将AT命令发送到此端口.如果我们在当前COM端口上找到调制解调器,则此函数返回true:

   private bool CheckExistingModemOnComPort(SerialPort serialPort)
   {
       if ((serialPort == null) || !serialPort.IsOpen)
           return false;
   
       // Commands for modem checking
       string[] modemCommands = new string[] { "AT",       // Check connected modem. After 'AT' command some modems autobaud their speed.
                                               "ATQ0" };   // Switch on confirmations
       serialPort.DtrEnable = true;    // Set Data Terminal Ready (DTR) signal 
       serialPort.RtsEnable = true;    // Set Request to Send (RTS) signal
   
       string answer = "";
       bool retOk = false;
       for (int rtsInd = 0; rtsInd < 2; rtsInd++)
       {
           foreach (string command in modemCommands)
           {
               serialPort.Write(command + serialPort.NewLine);
               retOk = false;
               answer = "";
               int timeout = (command == "AT") ? 10 : 20;
   
               // Waiting for response 1-2 sec
               for (int i = 0; i < timeout; i++)
               {
                   Thread.Sleep(100);
                   answer += serialPort.ReadExisting();
                   if (answer.IndexOf("OK") >= 0)
                   {
                       retOk = true;
                       break;
                   }
               }
           }
           // If got responses, we found a modem
           if (retOk)
               return true;
   
           // Trying to execute the commands without RTS
           serialPort.RtsEnable = false;
       }
       return false;
   }
   

2. 在下一阶段,我们可以从调制解调器收集一些数据.我使用了以下命令:

   • ATQ0 - 打开确认(每次请求都收到OK)
   • ATE0 - 打开回声
   • ATI - 获取调制解调器详细信息
   • ATI3 - 获取扩展调制解调器详细信息(并非所有调制解调器都支持此命令)